Details on Multi Theft Auto 0.5 (formerly known as MTA 0.4.5) have been released! What's new in it, you ask? Take a look below:

Huge increase in stability
Balanced stubby weapon
Two new GTA3 islands available including new gamemodes
Lots of changes to the existing maps
New server browser integrated into the MTA 0.5 client
Integrated MTA protocol handler (for mta:// links on websites)
Brand new client graphical interface
Rich text support for Message Of The Day, including colors and fonts
MTA Error Reporting Tool included within the installer (helps us fixing any bugs)
New MTA 0.5 Dedicated server binaries available for FreeBSD, OpenBSD and Linux
New installer and configuration tool for Linux dedicated servers

Zidane, I'd just like to post this here for a second. You misposted. MTA 0.5 is NOT out yet, and info has only been released about it :P You may want to change the name and such. If you take a look at the MTA 0.5 site, it says the following.

"Welcome to the download page. MultiTheftAuto 0.5 is not currently available for download. Please check back soon."

christianrrf, yes you can use MTA with a Vice City Crack, here is how you do it:
Take 20 dollars...
Go to your nearest Game Store....
Buy Vice City for PC....
Get rid of your Cracked Version....
Install Vice City...
Install MTA...